<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1{
            width: 1500px;
            height: 1500px;
            background: lightblue;
        }
        .box2{
            width: 50px;
            height: 100px;
            background: green;
            position: fixed;
            bottom: 0px;
            right: 0px;
        }
    </style>
</head>
<body>
    <div class="box1">
        
    </div>
    <div class="box2">
        
    </div>
</body>
</html>